The characteristics of the KeyMath Diagnostic Arithmetic Test and the Woodcock Reading Mastery Test were examined and compared among samples of learning disabled and non-learning disabled boys. The Woodcock was found to be quite similar for both the learning disabled and the non-learning disabled samples with high reliability and a unidimensional factor structure. The KeyMath also was quite similar for the two samples. It was found to have very high reliability, although the assumption of a unidimensional math achievement was found to be less defensible for the learning disabled sample.
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